Advertising sign holder for automobiles



FIG. 1 is a perspective view of an advertising sign holder for automobiles showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational thereof;

FIG. 5 is a front elevational thereof; and,

FIG. 6 is a rear elevational thereof. 

The ornamental design for an advertising sign holder for automobiles, as shown. 